<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 警告框 -->
      <el-alert
        title="注意:只允许第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_cop">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 级联选择框 -->
          <el-cascader
            v-model="selectCate"
            :options="cateList"
            expandTrigger="hover"
            :props="cateProps"
            @change="handleChange"
            change-on-select
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- 页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisplay"
            @click="addDialogVisible = true"
          >
            添加参数
          </el-button>
          <!-- 动态表格 -->
          <el-table :data="manyData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 渲染tag标签 -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClosed(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="inputClass"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInputRef"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else size="small" @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisplay"
            @click="addDialogVisible = true"
          >
            添加属性
          </el-button>
          <!-- 静态表格 -->
          <el-table :data="onlyData" border stripe>
            <!-- 展开行 -->
            <!-- 渲染Tag -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClosed(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="inputClass"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInputRef"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else size="small" @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 参数对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogVisibleClosed"
    >
      <!-- 参数对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      cateList: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      selectCate: [],
      activeName: 'many',
      manyData: [],
      onlyData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: '',
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ],
      },
    }
  },
  created() {
    this.getCatList()
  },
  methods: {
    async getCatList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status != 200) {
        return this.$message.error('获取分类失败')
      }
      this.cateList = res.data
    },
    handleChange() {
      this.getParamsData()
    },
    handleTabClick() {
      this.getParamsData()
    },
    async getParamsData() {
      if (this.selectCate.length !== 3) {
        this.selectCate = []
        this.manyData = []
        this.onlyData = []
        return
      }
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )
      if (res.meta.status != 200) return this.$message.error('获取参数失败')
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //添加文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyData = res.data
      } else {
        this.onlyData = res.data
      }
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      )
      if (res.meta.status !== 200)
        return this.$message.error('获取参数信息失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogVisibleClosed() {
      this.$refs.editFormRef.resetFields()
    },
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        }
      ).catch((error) => error)
      if (confirmResult !== 'confirm') return this.$message.info('取消了删除')
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) return this.$message.error('删除失败')
      this.$message.success('删除成功')
      this.getParamsData()
    },
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '),
        }
      )
      if (res.meta.status !== 200) return this.$message.error('添加参数项失败')
      this.$message.success('添加参数项成功')
    },
    showInput(row) {
      row.inputVisible = true
      //渲染当页面上元素被重新渲染之后立即调用
      this.$nextTick((_) => {
        this.$refs.saveTagInputRef.$refs.input.focus()
      })
    },
    // 删除对象参数项
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
  },
  computed: {
    isBtnDisplay() {
      if (this.selectCate.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectCate.length == 3) {
        return this.selectCate[2]
      }
      return null
    },
    titleText() {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    },
  },
}
</script>

<style scoped>
.cat_cop {
  margin: 20px 0;
}
.el-cascader {
  width: 20%;
}
.inputClass {
  width: 120px;
}
</style>